For white balance issues and a
prior discussion of using the "Custom White Balance"
feature of the Digital Rebel versus use of a "Color Correcting"
filter see Page 8.
Instead of using custom white
balance for correcting the color of daytime photographs with the
modified camera, I am getting better results using the X-nite
CC1 "Color Correcting" filter by maxmax.com. The color
correcting filter is mounted on the camera lens. The following
test images were taken to determine the ability of the color correcting
filter to allow for normal daytime photographs using the Auto
White Balance (AWB) camera setting. Camera settings used were
Processing was kept to the minimum
for testing: RAW images were converted to JPGs in Canon's "Digital
Photo Professional version 1.5" then resized in Photoshop
and saved as JPGs. No sharpening was done. The "No Modification"
images were taken with a Canon 10D. The "Modified Rebel"
images were taken with a Canon Digital Rebel with the IR Filter
removed and replaced with a coated clear glass window as explained
on Pages 1 through 10; and the
X-nite CC1 color correcting filter installed on the camera lens:
(10D)_______________________MODIFIED REBEL with X-nite CC1 Filter______
OUTDOOR - Full Sunlight:
INDOOR - Mix of incandescent
and fluorescent light:
Click on thumbnails
above for larger (900X600) images and image exposure settings
Conclusion: The X-nite CC1 color correcting filter
provides excellent color correction on the modified Digital Rebel.
The camera focus point of the modified camera has been retained
by use of the clear glass window and .1mm shims as discussed on
Page 9. The modified camera with
the clear glass window has the advantage of being very versatile
for astro and infrared imaging using cut and pass filters. One
color correcting filter can be mounted on a collection of lenses
by using step rings. A disadvantage of using a color correcting
filter is that the viewfinder image is dimmed slightly; so for
marginal low light conditions, manual and auto focus may be slightly
Processed image of Blue Jay
with Modified Rebel and X-nite filter:
HERE for a comparison
of the un-processed and processed images of the Blue Jay.
Continue to Page
11: Daytime Infrared Testing - 300D
Continue to Page
14: Daytime Infrared Testing - 450D